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Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
12 years ago

timer problem

I'm new to altera and c-programming. Just can't make the internal timer work.

int main(void)

{

volatile int * red_leds =(int*) 0x10000000;

volatile int * timer =(int*) 0x10002000;

int data, exit_data, delay, run;

//turning timer on

int counter = 0xee6b280; // 1/(50 mhz) x (0xee6b280) = 5 sec

*(timer + 0x8) = (counter & 0xffff);

*(timer + 0xc) = (counter >> 16) & 0xffff;

*(timer + 0x4) = 0x4;

run=*(timer);

*(red_leds)=0;

/////////////////////////////////////////////

while (run==0x00000001) //

{

*(red_leds)=0x000002aa;

}

while(1)

{

*(red_leds)=0;

}

}

5 Replies

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    12 years ago

    You defined timer as a pointer to int (=32bit) but then you used it with byte address increments, so you are not writing the correct registers.

    Anyway this is a deprecated way of programming.

    A few hints:

    - use the symbolic defines generated by sopc builder (in system.h file) instead of the numeric addresses 0x10000000, 0x10002000 which would possibly change if you regenerate the system

    - don't use pointers but rather the IOWR/IORD macros which automatically match the addressed memory data size

    - in this case it would be even better exploiting the timer control macros (IOWR_ALTERA_AVALON_TIMER_CONTROL, IOWR_ALTERA_AVALON_TIMER_PERIODL, ...) available in the HAL driver.
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    12 years ago

    thanks for answer, i've started to use macroses, but timer still isn't working.

    # include "system.h"

    # include "altera_avalon_timer_regs.h"

    # include "altera_avalon_pio_regs.h"

    int main(void)

    {

    //turning timer on

    // 1/(50 MHz) x (0x1DCD6500) = 10 sec

    IOWR_ALTERA_AVALON_TIMER_PERIODL (INTERVAL_TIMER_BASE + 0x8, 0x6500);

    IOWR_ALTERA_AVALON_TIMER_PERIODH (INTERVAL_TIMER_BASE + 0xC,0x1dcd);

    IOWR_ALTERA_AVALON_TIMER_CONTROL (INTERVAL_TIMER_BASE + 0x4, 0x4);

    run=IORD_ALTERA_AVALON_TIMER_STATUS(INTERVAL_TIMER_BASE);

    run=(run & 0x00000002);

    IOWR_ALTERA_AVALON_PIO_DATA(RED_LEDS_BASE, 0);

    /////////////////////////////////////////////

    while (run) //

    {

    IOWR_ALTERA_AVALON_PIO_DATA(RED_LEDS_BASE, 0x2AA);

    }

    while(1)

    {

    IOWR_ALTERA_AVALON_PIO_DATA(RED_LEDS_BASE, 0);

    }

    }
  • Altera_Forum's avatar
    Altera_Forum
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    12 years ago

    /*

    * Interval_timer configuration

    *

    */

    # define ALT_MODULE_CLASS_Interval_timer altera_avalon_timer

    # define INTERVAL_TIMER_ALWAYS_RUN 0

    # define INTERVAL_TIMER_BASE 0x10002000

    # define INTERVAL_TIMER_COUNTER_SIZE 32

    # define INTERVAL_TIMER_FIXED_PERIOD 0

    # define INTERVAL_TIMER_FREQ 50000000

    # define INTERVAL_TIMER_IRQ 1

    # define INTERVAL_TIMER_IRQ_INTERRUPT_CONTROLLER_ID 0

    # define INTERVAL_TIMER_LOAD_VALUE 6249999

    # define INTERVAL_TIMER_MULT 0.0010

    # define INTERVAL_TIMER_NAME "/dev/Interval_timer"

    # define INTERVAL_TIMER_PERIOD 125.0

    # define INTERVAL_TIMER_PERIOD_UNITS "ms"

    # define INTERVAL_TIMER_RESET_OUTPUT 0

    # define INTERVAL_TIMER_SNAPSHOT 1

    # define INTERVAL_TIMER_SPAN 32

    # define INTERVAL_TIMER_TICKS_PER_SEC 8.0

    # define INTERVAL_TIMER_TIMEOUT_PULSE_OUTPUT 0

    # define INTERVAL_TIMER_TYPE "altera_avalon_timer"
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    12 years ago

    --- Quote Start ---

    IOWR_ALTERA_AVALON_TIMER_PERIODL (INTERVAL_TIMER_BASE + 0x8, 0x6500);

    IOWR_ALTERA_AVALON_TIMER_PERIODH (INTERVAL_TIMER_BASE + 0xC,0x1dcd);

    IOWR_ALTERA_AVALON_TIMER_CONTROL (INTERVAL_TIMER_BASE + 0x4, 0x4);

    run=IORD_ALTERA_AVALON_TIMER_STATUS(INTERVAL_TIMER_BASE);

    --- Quote End ---

    Timer macros already include the offset.

    The correct usage is:

    IOWR_ALTERA_AVALON_TIMER_PERIODL (INTERVAL_TIMER_BASE, 0x6500);

    IOWR_ALTERA_AVALON_TIMER_PERIODH (INTERVAL_TIMER_BASE, 0x1dcd);

    IOWR_ALTERA_AVALON_TIMER_CONTROL (INTERVAL_TIMER_BASE , 0x4);